* objdump.c (objdump_print_addr): If displaying file offsets, show

* objdump.c (objdump_print_addr): If displaying file offsets, show
  the offset even if there are no symbols available.
  (dump_section): Display nothing if none of the section is going to
  be dumped.  Display the file offset, if requested, of the location
  from where the dump starts.
  * doc/binutils.texi (objdump): Mention that dumping via the -s
  switch is also affected by the -F option.